DRILL BIT FOR PERCUSSION-ROTARY DRILLING Russian patent published in 2019 - IPC E21B10/36 

FIELD: soil or rock drilling; mining.

SUBSTANCE: invention relates to the field of creating drilling rock cutting tools for percussion-rotary drilling wells. Drill bit for percussion-rotary drilling consists of a shank and a hemispherical head with rock-breaking elements placed on its working surface. At the end of the shank there is tore puck with an eccentric protrusion on the bottom installed with the possibility of angular rotation in a vertical plane. Movable hemispherical part of the head is equipped with a hinge element, providing the possibility of rotation of the movable part of the head relative to the shank in the plane of placement of the eccentric protrusion in the opposite direction from it. Movable hemispherical part of the head on the opposite side of the eccentric protrusion of the tore washer is equipped with an elastic element.

EFFECT: technical result consists in increasing the efficiency of rock destruction at the bottom of a well during percussion-rotary drilling when implementing an eccentric impact pulse and creating spalling forces acting in the bottom plane.

1 cl, 2 dwg